Isaiah 40:4 - Exposition

Every valley shall be exalted, etc.; rather, let every valley be exalted. The prophets are to see that the poor and lowly are raised up; the proud and self-righteous depressed; the crooked and dishonest induced to change their ways for those of simplicity and integrity; the rude, rough, and harsh rendered courteous and mild. "In general, the meaning is that Israel is to [be made] take care that the God who is coming to deliver it shall find it in such an inward and outward state as befits his … purpose".